<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .father {
      width: 100%;
      height: 60vw;
      background-color: pink;

      display: flex;
      justify-content: space-between;

      /* 多元素换行 */
      flex-wrap: wrap;
    }

    .father div {
      width: 20vw;
      height: 20vw;
      background-color: orange;
      border: 1px black solid;
      box-sizing: border-box;
    }
  </style>
</head>
<body>
  <div class="father">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
    <div>6</div>
    <div>7</div>
    <div>8</div>
  </div>
</body>
</html>